| Name | City | Grade range |
|---|---|---|
| Arbuckle Alternative High (Continuation) | Arbuckle | continuation |
| Arbuckle Elementary | Arbuckle | elementary |
| Colusa Alternative High (Continuation) | Colusa | continuation |
| Colusa Alternative Home | Colusa | alternative |
| Colusa County Community | Colusa | county community |
| Colusa County Opportunity | Colusa | opportunity |
| Colusa County Special Education | Colusa | special education |
| Colusa High | Colusa | high |
| George T. Egling Middle | Colusa | middle |
| Grand Island Elementary | Grimes | elementary |
| James M. Burchfield Primary | Colusa | elementary |
| Juvenile Hall-Nielson | Stonyford | juvenile hall |
| Lloyd G. Johnson Junior High | Arbuckle | middle |
| Maxwell Elementary | Maxwell | elementary |
| Maxwell High | Maxwell | high |
| Mid Valley High (Continuation) | Williams | continuation |
| Pierce High | Arbuckle | high |
| Williams High | Williams | high |
| Williams Junior High | Williams | middle |
| Williams Primary Elementary | Williams | elementary |
| Williams Upper Elementary | Williams | elementary |